
DM Bacon |

I know it's possible to lower Spell Resistance, but is it possible to lower or remove an immunity to a particular effect? For instance, a 20th level Sorcerer with the Protean bloodline gains immunity to Polymorph effects. Can that Sorcerer elect to remove that immunity if she wanted to cast a Polymorph spell on herself?

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Yup.
Voluntarily Giving up a Saving Throw
A creature can voluntarily forgo a saving throw and willingly accept a spell's result. Even a character with a special resistance to magic can suppress this quality.
Given that this line reads "special resistance to magic" rather than the specific term "spell resistance," I think it's pretty safe to assume that any resistance to a magical effect can be suppressed.

Some call me Tim |

I know it's possible to lower Spell Resistance, but is it possible to lower or remove an immunity to a particular effect? For instance, a 20th level Sorcerer with the Protean bloodline gains immunity to Polymorph effects. Can that Sorcerer elect to remove that immunity if she wanted to cast a Polymorph spell on herself?
The special ability explicitly says when cast on yourself you are not immune.
"Avatar of Chaos (Ex): At 20th level, you are infused with the essence of raw chaos. You gain immunity to acid, petrification, and polymorph effects (except when cast on self), as well as a +2 bonus to save DCs and on checks to overcome spell penetration against creatures with the lawful subtype."